Johann carl grabner and henri ruperti



(No Model.) 2 Sheets-Sheet 1. J. G. GRABNER 8v H. RUPERTI. CYLINDER AND PISTON MOTOR ENGINE.

Patented Apr. 8. 1890.

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(No Model.) 2 SheetsSheet 2; J. 0. G ABN R-zsv H. RUPBRTI. CYLINDER ANDIPISTON MOTOR ENGINE.

No. 425,172. Patented Apr. 8,1890.

UNITED STATES PATIENT OFFIC JOHANN CARL GRABNER AND HENRI RUPERTI, OF KUPFERHAMMER, NEAR BRACKVVEDE, PRUSSIA, GERMANY.

CYLlND ER AND PtSTON MOTOR-ENGINE.

SPECIFICATION forming part of Letters Patent No. 425,172, dated April 8, 1890.

Application filed August 30, 1889- Serial No. 322,448. (No model.)

To all whom it may concern.-

Be it known that we, J OI-IANN CARL GRAB- NER, a subject of the King of Bavaria, and HENRI RUPERTI, a subject of the Grand Duke of Mecklenburg, both residing at Kupferhammer, near Brackwede, WVestphalia, Prussia, German Empire, have invented new and use ful Improvements in Cylinder and Piston Motor-Engines, of which the following is a specification.

Our invention relates to motor-engines operated by steam, compressed air, or other expansive gases or-vapors, and has particular reference to the construction shown in Figures l to i of the drawings in a prior application filed by us on the'21st day of February, 1889, Serial No. 300,790.

We shall in the following description speak of steam as the motor fluid, but it is to be understood that the improvements are equally applicable to other expansible gases or vapors under pressure.

Our present improvements relate to the appliances for admitting the steam to and ex hausting the same from the cylinder.

Fig. 1 of the accompanying drawings is a longitudinal section of the engine-cylinder and piston and parts combined therewith, and Fig. 2 is a cross-section on line CD in Fig. 1.

The appliances for admitting steam to the cylinder A consist, first, of the two pistonslides h 71., connected by the rods 0 c with the air-buifer pistons d d, and, secondly, of the steam-passages a, a", b, m, and m The appliances for the exhaust consist of two piston-slides i and 1'', connected together by a rod, which are actuated by steam passing through the passages f and f. The piston-slides i and z" are connected by a rod with an air-buffer piston CZ".

The pistoirvalves are preserved from concussion either by means of the air-buffer pistons d d or by any other arrangement of buffers. p

The action of the apparatus is as follows: Assuming the piston B to be in the position shown in Fig. 1-namely, at the end of the stroke to the left handthen the steam-supply pipe at will. be in communication through port 17, hollow piston B, and existing opening between the edge 1 of the cylinder and edge 2 of the piston with the cylinder-space behind the piston. At the same time the pistonslide it will be pushed up into the position shown by the excess of steam-pressure on its under side (as the steam passing to its upper side through passage a only acts on an annular surface,) thereby uncovering the passage m, so that steam will then also pass through this passage behind the piston, causing it to commence its stroke to the right. When during such motion the edge 2 passes over edge 1, the steam will not be entirely out off, as this will only take place when the piston closes the passage m, and from this point the expansion will commence, In consequence of the resulting reduction of pressure, the full pressure exerted above the pistonslide h will now force it down again, closing the other end of passage on, and it will remain in this position until 011 the following stroke to the left of piston B the edge 2 again uncovers edge 1, when piston-slide h will be again forced upward. The same will take place with reference to piston-slide h when, toward the end of the stroke to the right, the

. edge 3 of piston B passes edge 4 of the cylinder, thereby admitting steam in front of the piston both through the opening 3 4 and the passage m and cushioning the piston at the end of its stroke. Steam will continue to be admitted until by the travel of the piston to the left the opening at 3 iis closed, as also the passage m, by the descent of the pistonslide h, whereupon expansion will take place as before.

The exhaust is governed by the exhaust piston-slides i "6, connected by a rod. At the commencement of the stroke to the right of the piston B the passage f is open, as shown, and the steam in front of the piston escapes through the exhaust-pipe g. As soon, however, as the edge 3 of the piston B reaches the opening of the passage f, steam will passfrom the interior of the piston B through passage f, behind piston-slide 2', thereby forcing it to the left hand and closing the exhaust-passage f, so that the compression in front of the piston B will commence. The same action will take place with regard to piston-slide i' and passages f and f (lurin the stroke to the left of piston B, f being open connected with said slides, and passagesf f in the cylinder A, connecting the piston B with the casing" of the slides 11 11, substantiallyns shown and described, for the purpose herein set forth.

In testimony whereof we have signed our nznnes to this specification in the presence of 20 two subscribing Witnesses.

JOI'IANN CARL GRABNER. HENRI RUPERTI. \Vitnesses:

.l'). J. PARTELLO, SCHULTZ. 

